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The Steelers had the AFC's best offense in 2015.

With Ben Roethlisberger, Antonio Brown, Martavis Bryant, Markus Wheaton and a returning Le'Veon Bell, safe to say they'll be dominant again in 2016.

Where the Steelers need a lot of help is on defense. In particular, their pass defense.

Pittsburgh finished with the fifth fewest rush yards allowed last season but simply couldn't stop the pass, finishing as the third worst pass defense in the NFL. Defensive end Stephon Tuitt is confident they'll turn things around, proclaiming the Steelers can be the No. 1 defense in the NFL next season. In order for that to happen, the front office needs to address their holes on that side of the ball.

Here are some prospects to watch heading into the Scouting Combine.

Top need: Cornerback

Other needs: Safety, Tight End, Pass Rushing DE

COLUMBIA, SC - NOVEMBER 28: Mackensie Alexander #2 of the Clemson Tigers reacts after breaking up a pass against the South Carolina Gamecocks during their game at Williams-Brice Stadium on November 28, 2015 in Columbia, South Carolina. (Photo by Streeter Lecka/Getty Images)

1. Mackensie Alexander, Clemson CB

Starting DBs Will Allen (13 starts last season) and William Gay (40 starts over the last three season) are free agents this offseason, so there are holes to fill in what was already a porous secondary.

I've seen Alexander projected as high as a top-10 pick in the draft, so it may be a bit of a reach with the Steelers sitting at No. 25, but a lot can change. Just ask Bleacher Report's Matt Miller, who reported three teams weren't thrilled with decision to declare for the draft early:

Clemson cornerback Mackensie Alexander left school after two seasons as a starter, but in talking to one AFC scout this week, they're not a fan of that decision. Three different team scouts confirmed this week that they have Alexander graded as a "Day 3" player given his smaller size (listed at 5'11", 195 lbs) and the fact he didn't record an interception at Clemson.

Listed at 5'11'' Alexander isn't on the tall side, but makes up for that with his incredible athleticism. Alexander was ranked as the fourth-best prospect in the country by coming out of high school. Despite not having any interceptions and just 10 passes defended, he was named to the All-Conference team because of the respect other teams had for him. Here are two interesting takes from analysts around the NFL

CB Mackensie Alexander reminds me a lot of a smaller version of Josh Norman. Zero INTs at Clemson, but his tape doesn't show many chances.

Mackensie Alexander's lack of production is a concern for teams. # of CB's drafted last 5 yrs with 0 career INT's? Answer: 0 (h/t @wgsmit3) — Daniel Jeremiah (@MoveTheSticks) February 18, 2016

With the range of where Alexander is being drafted so large, the combine will be vital for him to help prove his value. Will he establish himself as a first-round talent? Could he slip to a day three pick?

Regardless, the Steelers will have their eye on him.

GLENDALE, AZ - JANUARY 01: Defensive player of the game Eli Apple #13 of the Ohio State Buckeyes holds the MVP trophy after the BattleFrog Fiesta Bowl at the University of Phoenix Stadium on January 1, 2016 in Glendale, Arizona. The Ohio State Buckeyes beat the Notre Dame Fighting Irish 44-28. (Photo by Norm Hall/Getty Images)

2. Eli , Ohio State CB

Here's a trivia question for you: who was the player that intercepted Marcus Mariota's final collegiate pass?

You guessed it. Eli Apple.

At 6'1'', Apple is an important two inches taller than Alexander. He combines that size with strength that will allow him to compete with the NFL's best at the next level. With 86 tackles and 7.5 tackles for loss in his two years with the Buckeyes, he's proven himself to be a capable tackler in the run game as well. NFL.com's Lance Zierlein elaborated on his potential

Good height, weight and arm length combination. Clean footwork in transition with natural ability to mirror and match from press coverage. Won’t open hips early and rarely turned around off line of scrimmage. Has foot quickness in short spaces to maintain feel for his man. Extremely competitive when ball is in the air.

He showed off some of his playmaking skills, saving the game versus Indiana:

Looking at their recent history, the Steelers are comfortable with Ohio State players. They took Cameron Heyward in the first-round of 2011, Ryan Shazier in 2014 and cornerback Doran Grant in the fourth-round last year.

Apple is another player who would fill a tremendous need on their roster if available at No. 25.

GLENDALE, AZ - JANUARY 11: Kevin Dodd #98 of the Clemson Tigers reacts after a play in the second quarter against the Alabama Crimson Tide during the 2016 College Football Playoff National Championship Game at University of Phoenix Stadium on January 11, 2016 in Glendale, Arizona. (Photo by Ronald Martinez/Getty Images)

3. Kevin Dodd, Clemson DE

What's another way to help a poor secondary? Get to the quarterback quicker.

First-round picks Jarvis Jones, Ryan Shazier and Bud Dupree all have tons of potential but haven't produced very much in terms of sacks

At 6'5'', 275 lbs, Kevin Dodd broke out this past season after spending time behind the likes of Shaq (projected first-round pick this year) and Vic Beasley (1st-round pick last year). With 12 sacks and 23.5 tackles for loss, Dodd was among the best pass-rushers in America. After receiving limited playing time in 2014, Dodd's quarterback pressures leaped from just three to 46 last season, according to NFL.com's Lance Zierlein. Saving his best for last, Dodd recorded three sacks and seven tackles in the National Championship game against Alabama.

Here's more from Zierlein on Dodd:

Athletic upfield burst with desired bend and hip flexion to corner the edge. Has length and leverage to become an effective speed-­to­-power rusher. Wore Alabama out with three sacks and two tackles for loss. Tape shows a player who played his best football at the end of the year.

Scouts will have (legitimate) concerns that Dodd is just a one-year wonder, but at the end of the first-round the Steelers may also be getting an up-and-coming talent just realizing his potential. In fact, according to Tony Pauline of DraftInsider.net, Dodd has been getting more attention from teams than his teammate Shaq Lawson.

He has been working on linebacker techniques with former NFL defensive coordinator Ted Cottrell and will run through OLB position drills during Pro-day if asked. I’m told his forty goal at the combine is 4.8-seconds or faster.

Depending on how he fares at the combine, Dodd may play himself out of range for the Steelers at No. 25, but until then, he's a player the team and their fans must keep an eye on.

The way the offense played last season, this defense doesn't need to be Broncos-esque for the Steelers to win. Heath Miller's retirement could induce the front office to look for a TE early such as Arkansas' Hunter Henry, but he isn't a first-round talent at this point in the pre-draft process.

With Tuitt, Heyward, Shazier, Dupree and others, the Steelers have a young front seven with tremendous potential. Getting last year's second-round pick Senquez Golson back after missing the entire season following an injury in training camp will help, but to become a Super Bowl worthy defense, they'll need to add to their secondary or supplement it with a stronger pass rush.